hi, ive got some twisted code that runs on its own and some python code that also runs on its own, now i would like to combine the two, so i added: if __name__ == '__main__': app = QtWidgets.QApplication(sys.argv) # your code to init QtCore import qt5reactor qt5reactor.install() from twisted.internet import reactor to use some qt reactor with twisted. running the qt code with those lines also works. but as soon as i import other code into this one i get: python main_code.py Gtk-Message: Failed to load module "canberra-gtk-module" Traceback (most recent call last): File "main_code.py", line 29, in <module> qt5reactor.install() File "/home/julius/.local/lib/python2.7/site-packages/qt5reactor.py", line 412, in posixinstall installReactor(p) File "/home/julius/.local/lib/python2.7/site-packages/twisted/internet/main.py", line 32, in installReactor raise error.ReactorAlreadyInstalledError("reactor already installed") twisted.internet.error.ReactorAlreadyInstalledError: reactor already installed here is my code: when importing get_main_page i get the error above... import sys from PyQt5 import QtWidgets from untitled import Ui_MainWindow #from webchat import get_main_page class Main(QtWidgets.QMainWindow): def __init__(self): QtWidgets.QMainWindow.__init__(self) self.ui = Ui_MainWindow() self.ui.setupUi(self) self.setupSignals() def button_1_Clicked(self): self.ui.textbox_2.setText(self.ui.textbox_1.text()) def setupSignals(self): #self.ui.textbox_1.textChanged.connect(self.textbox_1_Changed) self.ui.button_1.clicked.connect(self.button_1_Clicked) if __name__ == '__main__': #app = QtWidgets.QApplication(sys.argv) app = QtWidgets.QApplication(sys.argv) # your code to init QtCore import qt5reactor qt5reactor.install() from twisted.internet import reactor print "testing..." #get_main_page() window = Main() window.show() #sys.exit(app.exec_()) def printMe(argument): print argument def lala(): reactor.callLater(5, printMe, '123') lala() reactor.run() webchat.py (containing get_main_page) starts with the lines: from twisted.web.client import Agent, CookieAgent, getPage, HTTPClientFactory from bs4 import BeautifulSoup import json import urllib import random from myglobals import * from twisted.internet.task import LoopingCall how can i get a more "refined" error message, that actually tells me which line is causing the error? because as i said, the line 29 in main_code works when i do not import get_main_page